Sunrise 5:56 AM   Sunset 9:11 PM Moonrise 4:23 PM   Moonset 3:16 AM

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LMZ362 Expires:202405192115;;483337 Fzus63 Kmkx 191413 Glflm
open lake forecast for lake michigan national weather service milwaukee/sullivan wi 913 am cdt Sun may 19 2024
for waters beyond five nautical miles of shore on lake michigan.
waves are provided as a range of significant wave heights, which is the average of the highest 1/3 of the wave, along with the average height of the highest 10% of the waves which will occasionally be encountered.
Synopsis -
light northerly winds will continue this morning, before becoming light and variable as high pressure of 30.0 inches moves through this afternoon and weakens the pressure gradient. Southwest winds Monday morning will become southeasterly ahead of an approaching low pressure system of 29.6 inches. Breezy southerly winds will remain Tuesday into Wednesday as another low pressure system advances toward the great lakes region. Periods of Thunderstorms are also expected over the lake Monday through Wednesday morning.
lmz261-362-364-366-563-565-567-868-192115- lake michigan from seul choix point to rock island passage 5 nm offshore to mid lake- lake michigan south of a line from seul choix point to the mackinac bridge and north of a line from charlevoix mi to south fox island 5 nm offshore- lake michigan from charlevoix to point betsie mi 5 nm offshore to mid lake- lake michigan from point betsie to manistee mi 5 nm offshore to mid lake- lake michigan from rock island passage to sturgeon bay wi- lake michigan from sturgeon bay to two rivers wi 5 nm offshore to mid lake- lake michigan from two rivers to sheboygan wi 5 nm offshore to mid lake- lake michigan from pentwater to manistee mi 5 nm offshore to mid lake- 913 am cdt Sun may 19 2024
sheboygan wi to pentwater mi north - .
Rest of today - Northwest winds 10 to 20 kt becoming southwest. Waves 1 to 3 ft. Tonight - South winds 10 to 15 kt becoming southeast. Waves 1 to 2 ft. Monday - Southeast winds 10 to 15 kt becoming south 10 to 20 kt. Chance of showers in the morning, then showers likely with a chance of Thunderstorms in the afternoon. Waves 1 to 3 ft. Monday night - Southwest winds 10 to 15 kt. Showers likely with a chance of Thunderstorms in the evening, then showers likely overnight. Waves 1 to 3 ft. Tuesday - East winds 10 to 15 kt. Chance of showers. Waves 1 to 3 ft. Tuesday night - Southeast winds 15 to 25 kt becoming south to 30 kt. Showers with a chance of Thunderstorms. Waves 3 to 5 ft building to 5 to 8 ft occasionally to 10 ft. Wednesday - South winds to 30 kt becoming southwest. Chance of showers. Waves 5 to 8 ft occasionally to 10 ft. Thursday - West winds 15 to 25 kt becoming southwest. Waves 2 to 4 ft.

LMZ300
No data

FXUS63 KAPX 191317 AFDAPX

Area Forecast Discussion National Weather Service Gaylord MI 917 AM EDT Sun May 19 2024

KEY MESSAGES

- Lingering Rain/storms this morning

- Dry and warm with fire weather concerns this afternoon

- A round of showers and thunderstorms is expected late Monday afternoon into Monday night. Marginal Risk (1/5) for severe thunderstorms.

- Cold frontal passage Tuesday night brings another chance for a round of showers and thunder.

- Cooler and occasionally unsettled Thursday and beyond.

UPDATE
Issued at 917 AM EDT Sun May 19 2024

No major changes needed. Cold front is evident as a skinny band of cu over ne lower MI, and will progress into se lower MI today. A bubble high trailing the front builds into upper MI this afternoon. Any slight chance for precip will end as the front departs, with re-ignition along the front more likely well to our south later today. Weak cool/dry advection will continue; the main drying component will be increased vertical mixing into much drier air aloft. Elevated fire danger remains a reasonable approach for this afternoon/evening, as RHs should crater into the 20-25% range. Limited cloud cover, except for an initial increase in cirrus blowoff into western/northern areas late.

SHORT TERM /THROUGH TONIGHT/
Issued at 404 AM EDT Sun May 19 2024

PATTERN SYNOPSIS/FORECAST:

Zonal longwave trough across the northern US/southern Canada...with a lobe dropping into the western end of this over the PacNW. An upper low continues to spin across the SE US...with some troughing over SoCal. Primary focus for MI attm is a vort max on the eastern end of the northern stream trough...spiraling over western Ontario early this morning. Strengthening height falls and CAA into the Upper Midwest with this...and looking at a triple point over W.
Central Ontario with an occluded low back over the Manitoba/Ontario border. Surface cold front stretches down through W. WI, wrapping back into KS as of 5z. Some convective activity well ahead of this over WI/upper MI...running into a less favorable environment overall the further east it gets...and not surprised to see this start dying...though cell moving into mbL attm produced a gust to 31kts at the airport as gust front begins to outrun the initial cell.
Interestingly the temp went up at TVC with the gust front, potentially thanks in part to some downsloping...so not impossible that TC sees it high very early this morning, with northerly winds today likely to keep things from getting too out of hand temp-wise.

Cold front to continue to progress through the area this morning...ultimately swinging out of the Saginaw Bay region this afternoon, with the expectation that any lingering showers/storms should be exiting stage right between 14-16z. High pressure/subsidence and a very dry air mass in its wake for most of the day, especially across NW Lower (upstream dewpoints generally in the upper 30s to low 40s behind the front across N. WI/western UP as of 6z)...with potential for very low afternoon RHs amid warmth and winds gusting 10-15mph that could be a slight concern on the fire weather front. Southern portion of the front looks to stall out more or less zonally across southern lower MI going into tonight...as return flow strengthens to our west going into Sunday night.

Primary Forecast Concerns:

Lingering Storms this Morning...A few hundred joules of elevated CAPE expected this morning across NE Lower ahead of the front, which, with the added lift from the front, has some potential to be achieved...largely south of a line from Alpena to perhaps HTL or Gladwin-ish. Would not be surprised to see some slightly beefier storms over in this region...though think anything would be more pulsey in nature than terribly well organized, given deep layer shear isn't very strong...and the front should be waning in intensity with time, too. Blob of convection passing between TVC and CAD as of 7z does give me a bit of hesitancy that it could negatively impact the environment...though dewpoints in its wake for now seem to be creeping upward, which could give a slight boost to convective instability initially as dry air moves in aloft immediately behind the front...before we start to mix out too much.
Not expecting this threat to last very long, though...as the front may be out of here fairly quickly in the morning...and we should quickly begin to mix down that drier air aloft.

Afternoon RHs/Fire Weather Concerns... Temps expected to reach into the 70s and low 80s over the Saginaw Bay region, where best downsloping is expected. I do have to wonder, though, noting that the temp at TVC went up to 73 in the last few hours (at least in part due to downsloping with the gust front from that cell that moved through mbL)...if they will get warmer than currently expected over there...or if they will end up being held in the mid 70s by generally northerly flow off the Bay
Either way
very dry air mass advecting in from the west should support dewpoints dropping into at least the upper 30s or lower across a great portion of the area...though I have a suspicion we'll be looking at dewpoints in the low 30s across parts of the area, especially where north/northwest flow aids in downsloping. (Would not be surprised if we end up lower than this...though given that a lot of the area has been greening up...think it's still possible we may not get as low as we otherwise could.) This should bring critical RHs to a majority of the area...which will be of concern for fire weather purposes, with wind gusts floating around 10-15mph at max today.

LONG TERM /MONDAY THROUGH SATURDAY/
Issued at 404 AM EDT Sun May 19 2024

Pattern Synopsis / Forecast:

Associated uptick in southerly flow ahead of an ejecting trough and associated developing surface low across the central Plains will be enough to force a stationary front northward from downstate into the APX footprint through the day Monday, resulting in a rich moisture feed to the region. As this happens, progressive 500mb flow will drive a subtle shortwave along the front from the western Corn Belt into the Great Lakes, bringing about potential for rounds of showers and thunderstorms later Monday afternoon into Monday night as the front stalls out overhead Monday night, which likely continues shower and storm chances into Tuesday. Upstream, the aforementioned developing cyclone deepens considerably (potentially sub 990mb) as it surges into the vicinity of western Lake Superior. This should provide ample warm air advection to force the stalled frontal boundary north of Lake Superior, putting the region firmly within the warm sector of the cyclone by late Tuesday afternoon. Associated cold frontal boundary looks to surge through the area Tuesday night, and pending on if we can destabilize / remain unstable enough, this may set the stage for another round of showers and thunder across the region. Low pressure will become closed off somewhere in the vicinity of the upper Great Lakes after Tuesday night, which should deliver cooler air to the region, but the continued presence of shortwaves pivoting around this system will lead to some continuity of unsettled weather through the remainder of the week before things dry out some Thursday and Friday.

Temps: 70s and 80s Monday (could change based off morning cloud cover / rain trends), mainly 70s Tuesday (near 80 closer to Saginaw Bay). 60s and 70s Wednesday fall to somewhat more seasonable upper 50s to mid 60s Thursday and Friday.

Primary Forecast Concerns:

Sneaky Active Monday / Monday Night?: Better forcing is expected to arrive as a quick-moving wave rides along the northward lifting frontal boundary into Michigan. Latest CAMs are all over the place with where this jolt of energy will result in surface based showers and storms to blossom in the vicinity of the front (where surface dewpoints bump into the low-to-mid 60s and rapid destabilization up to ~1250 to 2000 J/kg MLCAPE may materialize). Where this surface based instability is realized, there is potential to see a stronger storm. Not a lot of shear present in the grand scheme of things , most likely gusty outflow driven / multicell storms that potentially evolve into a bowing segment... some hail is possible too). Some models initiate as far north as the Bridge... and this appears to be taken into consideration by SPC as they have introduced a Marginal Risk (1/5) of severe storms Monday for locales south of the Bridge.
Another factor looks to be efficient rainfall. PWATS of 1.25-1.50 are expected by Monday evening, which based off APX sounding climo, is well above the 90th percentile for the mid-late May. The atmosphere is going to be juiced, and with the wave approaching closer to 21-00z, that opens the door for instability to be maximized. As such, model soundings show a textbook "skinny CAPE" profile found with heavy rainfall events. It's not impossible for localized 2.00"+ rainfalls in a short timeframe, especially in any areas that see multiple storms. At this time, the favored area for this in the CWA is M-72 and south into central Michigan.

Tuesday: Stalled warm front will be forced farther northward by deepening low pressure across the western Corn Belt, which then proceeds to move into the vicinity of western Lake Superior. On paper, this is a favorable spot for low pressure to produce severe weather in the APX footprint, but there will be some significant hindrances. First, the nocturnal passage of the front brings question to how much can initiate along the front, especially if deep convection over IA/IL/WI follows an instability gradient and passes to our south, choking off deeper moisture flow. Good dynamics in place suggest a severe threat if we can get anything to initiate.
Potential for CAPE values in excess of 1,000 J/kg, bulk shear of 45- 55kts, coupled with diffluent flow aloft suggest that deeper convection and tilted updrafts are a distinct possibility Tuesday night. Given the later timing and excellent forcing, thoughts are still that this setup would favor a linear convective mode (QLCS?)
with all severe hazards on the table. As such, SPC has placed areas west of US 131 in a Slight Risk (2/5) and the rest of the area in a Marginal Risk (1/5) for severe storms. Will have to continue to watch the evolution of this setup over the next two days.

AVIATION /12Z TAFS THROUGH 12Z MONDAY/
Issued at 645 AM EDT Sun May 19 2024

Cold front crossing the area this morning. Lingering fog/low stratus over CIU and APN to lift quickly. Few high-based (7kft) cu trying to be CB attm...best chance for any development into TS through 16z would be from APN to HTL and east toward OSC/Y31...but chance is very small; have put VCSH for APN this morning to account for this.
Otherwise...expecting clear skies and NNW winds 5-15kts; low probabilities of gusts up to 20kts. Lake breezes to develop this afternoon, with greatest impact at APN where winds should try to switch to more easterly. Flow begins to turn to the SE this evening with increasing high clouds (cloud bases 10kft and up).
For now...expecting TS/RA chances to hold off till after this TAF period.

APX WATCHES/WARNINGS/ADVISORIES
MI...None.
MARINE...None.

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